CloseTheDoor Alternatives

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Advanced Port Scanner is a fast and free software for port scanning.

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TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...

Total Network Monitor is a network monitoring software that is designed to continuously monitor your local network, individual computers, and services. Free for 60 days.

SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.

Advanced IP Scanner shows all network devices, gives you access to shared folders, and can even remotely switch computers off. Download it Free.

TCPEye is an easy-to-use monitoring application that will display a list of all network processes.

CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.

Free Port Scanner is a small, fast, easy-to-use and robust port scanner for the Win32 platform.

Netcat is a featured networking utility which reads and writes data across network connections...

tcpdump is a common packet analyzer that runs under the command line.

MyLanViewer Network/IP Scanner - Best LAN/network IP address scanner for Windows.

This freeware portable network scanner displays active computers with logged user names (NetBIOS), MAC and IP addresses.